fs = require 'fs'
path = require 'path'
_ = require 'underscore-plus'

module.exports = (grunt) ->
  {cp, isAtomPackage, mkdir, rm} = require('./task-helpers')(grunt)

  grunt.registerTask 'build', 'Build the application', ->
    shellAppDir = grunt.config.get('atom.shellAppDir')
    buildDir = grunt.config.get('atom.buildDir')
    appDir = grunt.config.get('atom.appDir')

    rm shellAppDir
    rm path.join(buildDir, 'installer')
    mkdir path.dirname(buildDir)

    # Atom-shell IS the executable. We just need to make sure our Edgehill
    # app ends up in the correct `app` folder for atom-shell to find.
    if process.platform is 'darwin'
      cp 'atom-shell/Atom.app', shellAppDir, filter: /default_app/
      cp(path.join(shellAppDir, 'Contents', 'MacOS', 'Atom'),
         path.join(shellAppDir, 'Contents', 'MacOS', 'Edgehill'))
      rm path.join(shellAppDir, 'Contents', 'MacOS', 'Atom')
    else if process.platform is 'win32'
      cp 'atom-shell', shellAppDir, filter: /default_app/
      # We can rename atom.exe to edgehill.exe, but all of the node libraries with
      # native code are hard-linked to a file called atom.exe. For now, let's just
      # leave it as atom.exe. https://github.com/atom/atom-shell/issues/713
    else
      cp 'atom-shell', shellAppDir, filter: /default_app/
      cp path.join(shellAppDir, 'atom'), path.join(shellAppDir, 'edgehill')
      rm path.join(shellAppDir, 'atom')

    mkdir appDir

    # Note that `atom.sh` can't be renamed `edgehill.sh` because `apm`
    # is currently hard-coded to call `atom.sh`
    if process.platform isnt 'win32'
      cp 'atom.sh', path.join(appDir, 'atom.sh')

    cp 'package.json', path.join(appDir, 'package.json')
    cp path.join('resources', 'edgehill.png'), path.join(appDir, 'edgehill.png')

    packageDirectories = []
    nonPackageDirectories = [
      'benchmark'
      'dot-nylas'
      'vendor'
      'resources'
    ]

    {devDependencies} = grunt.file.readJSON('package.json')

    for child in fs.readdirSync('node_modules')
      directory = path.join('node_modules', child)
      if isAtomPackage(directory)
        packageDirectories.push(directory)
      else
        nonPackageDirectories.push(directory)

    for child in fs.readdirSync('internal_packages')
      directory = path.join('internal_packages', child)
      if isAtomPackage(directory)
        packageDirectories.push(directory)
      else
        nonPackageDirectories.push(directory)

    # Put any paths here that shouldn't end up in the built Atom.app
    # so that it doesn't becomes larger than it needs to be.
    ignoredPaths = [
      path.join('git-utils', 'deps')
      path.join('oniguruma', 'deps')
      path.join('less', 'dist')
      path.join('npm', 'doc')
      path.join('npm', 'html')
      path.join('npm', 'man')
      path.join('npm', 'node_modules', '.bin', 'beep')
      path.join('npm', 'node_modules', '.bin', 'clear')
      path.join('npm', 'node_modules', '.bin', 'starwars')
      path.join('pegjs', 'examples')
      path.join('jasmine-reporters', 'ext')
      path.join('jasmine-node', 'node_modules', 'gaze')
      path.join('jasmine-node', 'spec')
      path.join('node_modules', 'nan')
      path.join('build', 'binding.Makefile')
      path.join('build', 'config.gypi')
      path.join('build', 'gyp-mac-tool')
      path.join('build', 'Makefile')
      path.join('build', 'Release', 'obj.target')
      path.join('build', 'Release', 'obj')
      path.join('build', 'Release', '.deps')
      path.join('vendor', 'apm')
      path.join('resources', 'linux')
      path.join('resources', 'mac')
      path.join('resources', 'win')

      # These are only require in dev mode when the grammar isn't precompiled
      path.join('atom-keymap', 'node_modules', 'loophole')
      path.join('atom-keymap', 'node_modules', 'pegjs')
      path.join('atom-keymap', 'node_modules', '.bin', 'pegjs')
      path.join('snippets', 'node_modules', 'loophole')
      path.join('snippets', 'node_modules', 'pegjs')
      path.join('snippets', 'node_modules', '.bin', 'pegjs')

      '.DS_Store'
      '.jshintrc'
      '.npmignore'
      '.pairs'
      '.travis.yml'
    ]
    ignoredPaths = ignoredPaths.map (ignoredPath) -> _.escapeRegExp(ignoredPath)

    # Add .* to avoid matching hunspell_dictionaries.
    ignoredPaths.push "#{_.escapeRegExp(path.join('spellchecker', 'vendor', 'hunspell') + path.sep)}.*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('build', 'Release') + path.sep)}.*\\.pdb"

    # Ignore *.cc and *.h files from native modules
    ignoredPaths.push "#{_.escapeRegExp(path.join('ctags', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('git-utils', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('keytar', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('nslog', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('oniguruma', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('pathwatcher', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('runas', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('scrollbar-style', 'src') + path.sep)}.*\\.(cc|h)*"
    ignoredPaths.push "#{_.escapeRegExp(path.join('spellchecker', 'src') + path.sep)}.*\\.(cc|h)*"

    # Ignore build files
    ignoredPaths.push "#{_.escapeRegExp(path.sep)}binding\\.gyp$"
    ignoredPaths.push "#{_.escapeRegExp(path.sep)}.+\\.target.mk$"
    ignoredPaths.push "#{_.escapeRegExp(path.sep)}linker\\.lock$"
    ignoredPaths.push "#{_.escapeRegExp(path.join('build', 'Release') + path.sep)}.+\\.node\\.dSYM"

    # Hunspell dictionaries are only not needed on OS X.
    if process.platform is 'darwin'
      ignoredPaths.push path.join('spellchecker', 'vendor', 'hunspell_dictionaries')
    ignoredPaths = ignoredPaths.map (ignoredPath) -> "(#{ignoredPath})"

    testFolderPattern = new RegExp("#{_.escapeRegExp(path.sep)}te?sts?#{_.escapeRegExp(path.sep)}")
    exampleFolderPattern = new RegExp("#{_.escapeRegExp(path.sep)}examples?#{_.escapeRegExp(path.sep)}")
    benchmarkFolderPattern = new RegExp("#{_.escapeRegExp(path.sep)}benchmarks?#{_.escapeRegExp(path.sep)}")

    nodeModulesFilter = new RegExp(ignoredPaths.join('|'))
    filterNodeModule = (pathToCopy) ->
      return true if benchmarkFolderPattern.test(pathToCopy)

      pathToCopy = path.resolve(pathToCopy)
      nodeModulesFilter.test(pathToCopy) or testFolderPattern.test(pathToCopy) or exampleFolderPattern.test(pathToCopy)

    packageFilter = new RegExp("(#{ignoredPaths.join('|')})|(.+\\.(coffee|cjsx|jsx)$)")
    filterPackage = (pathToCopy) ->
      return true if benchmarkFolderPattern.test(pathToCopy)

      pathToCopy = path.resolve(pathToCopy)
      packageFilter.test(pathToCopy) or testFolderPattern.test(pathToCopy) or exampleFolderPattern.test(pathToCopy)

    for directory in nonPackageDirectories
      cp directory, path.join(appDir, directory), filter: filterNodeModule

    for directory in packageDirectories
      cp directory, path.join(appDir, directory), filter: filterPackage

    cp 'spec', path.join(appDir, 'spec')
    cp 'spec-nylas', path.join(appDir, 'spec-nylas')
    cp 'src', path.join(appDir, 'src'), filter: /.+\.(cson|coffee|cjsx|jsx)$/
    cp 'static', path.join(appDir, 'static')

    cp path.join('apm', 'node_modules', 'atom-package-manager'), path.join(appDir, 'apm'), filter: filterNodeModule
    if process.platform isnt 'win32'
      fs.symlinkSync(path.join('..', '..', 'bin', 'apm'), path.join(appDir, 'apm', 'node_modules', '.bin', 'apm'))

    if process.platform is 'darwin'
      grunt.file.recurse path.join('resources', 'mac'), (sourcePath, rootDirectory, subDirectory='', filename) ->
        unless /.+\.plist/.test(sourcePath)
          grunt.file.copy(sourcePath, path.resolve(appDir, '..', subDirectory, filename))

    if process.platform is 'win32'
      cp path.join('resources', 'win', 'atom.cmd'), path.join(shellAppDir, 'resources', 'cli', 'atom.cmd')
      cp path.join('resources', 'win', 'atom.sh'), path.join(shellAppDir, 'resources', 'cli', 'atom.sh')
      cp path.join('resources', 'win', 'atom.js'), path.join(shellAppDir, 'resources', 'cli', 'atom.js')
      cp path.join('resources', 'win', 'apm.sh'), path.join(shellAppDir, 'resources', 'cli', 'apm.sh')

    dependencies = ['compile', 'generate-license:save', 'generate-module-cache', 'compile-packages-slug']
    dependencies.push('copy-info-plist') if process.platform is 'darwin'
    dependencies.push('set-exe-icon') if process.platform is 'win32'
    grunt.task.run(dependencies...)

    grunt.log.ok("Built Edgehill into #{buildDir}")